Gravel deposits are found in Henderson County in the stream terrace deposits of the Trinity River and its tributary, Cedar Creek. These deposits were examined in detail in the vicinity of Trinidad. It was found that four terrace levels contain gravel. The top of the lowest of these terraces is 10 to 15 feet above the level of the floodplain, and the base of the terrace is below floodplain level. The gravel lies in the lower part of the terrace deposit, with the upper part consisting of loam and silt. This terrace lies adjacent to the river floodplain or adjacent to the floodplain of Cedar Creek.